小麥雜種初期世代に於ける栽植法に關する研究 (第2報) : 混在せる因子型間の競合
スポンサーリンク
概要
- 論文の詳細を見る
Ten varieties of wheat were sown in 1939 and five in 1940, by two methods. In the first method, each variety was sown in a seperate lot; in the second one, they were sown in a mixture in much the same condition the authors obtainod as the plant stand in the early generations of hybrid where various genotypes were mixed. Several important characters in young and adult stages were investigated by the two methods. The result showed that difference in means and deviations for each variety was found due to the difference of methods, for instace, as is shown in Table l. It was proved by Student method that the difference was significant in the means but insinificant in the deviations. This fact indicates that the competition caused by planting in a mixture is prominent not flactuately but quantitatively. The competition varies by the characters as shown in the competition-values in Table 2, the order of which is as follows; heading time < culm height < weight per plant. It appeared already in the young strge (See Table 3), but the competition in this stage is not always consistent with the one in the adult stage as the signs of the competition-values reverse by varieties between the two strges. It has been pointed out by Clement et al (1929) aud other investigatons that the competition is caused by various environmental factors. Plants having different genotypes should naturally show morphological difference in their young stage they planted in a mixture, and from these difference the unbalance in aerial and edaphic occupations will be caused among the plants as they grow, therefore factors concerning the growth act good on some plants and badlly on the others. Through these behaviors genotypical forms will be warped, in other words, competition appears. The most remarkable characteristics in young stage of wheat is the recumbence or the types of young plant. In Table 3 and 4, close relations are shown between the types of youns plants and the oompetition. Growth of the erect types was good but that of the prostrate types was poor, when they were planted together. As a rule, competition was more remarkable in thick planting than in thin one, and injurious influenee of the trasplanting upon the competition varied by chracters, as shown in Table 5. The more remerkable is the competition, the more difficult is the selection in breeding tech nically; therefore in the early generation of wheat hybrids it is more advantageous to adopt the characters and cultural methods in which the competitions are less remarkable, such as heading time and culm height in the fomer and thin planting in the latter.
- 日本作物学会の論文
- 1949-10-30